Elevator-door lock



May .1, 1923. 1,453,915

C. W. CARR ET AL ELEVATOR DOOR LOCK Filed March 2. 1922 671171 723Wflarr Egbert J. D 2121, NVENTORS fete? W Uorzouer A TTORNE Y.

Patented May 1, 1923.

UNITED 'STATES' a q 1,453,915 PAWEENT oFFie-E.

CHARLES w. CARR, ROBERT J. DIXON, Ann rn'riiia ooitoirnn',*or oenmv m;

ELEvA'roR-nooR LooK.

Application filed March 2, 1922. 'Serial No. 540,425.

Toullwhom itmay concern; v

Be it known that we,.- Cnne s W. C OB RT DI N, aDdP R. W- QO Q Rcitizens of the United States, residing at O'g-i den, in the county ofWeberand State of Utah, have invented certain newfand usefulImprovements inElevator-Door Locks,

of which the following is a" specification This invention has reference.to elevator doorlo'cks of extremelysimple constrirotion and not liableto get out of order andwhich be safe and reliable in operation as may We1 as requiring the completionof anelec;

tric circuit before the elevator can be started.

closed until theparts' are operated to effect the unlocking .of' thedevice. i 7

- One of the lock members is provided with circuit terminals and may bemade fast to a fixed part of the doorcarrying the lock, while the otherlatch member maybe made fastto acatch member, which on the closing ofthe door completes the circuit and renders it possible to starttheelevator in operation,

which starting of the elevator cannot be accomplished until the circuitis completed.

One of the companion lock casings is provided with a gravity catch andthe other lock casing is provided with a keeper which under certaincircumstances may be engaged by the catch and so hold the two lockmembers against escape until desired.

The catch is responsive to hand move ment and is adapted to operate acontact member completing an electric circuit within the casingcontainlng the contact member v 1 which in turn is responsive vto the.impact of the contact member so as to cause the locking of the contactmember in-the closing.

' position thus establishing an electric circuit.-

-The invention will be best understood from a consideration of thefollowing jde tailed description taken in connection with theaccompanying drawings forming part of this specification with theunderstanding however that the invention is not confined to any strictconformity to the showing of the drawings, butmay be changed andmodified so long as suchjchanges and modifications mark no materialdeparture from the salient features of theinvention as expressed in theappended claims. 7

nOt Iliecessarilythe same size and co' witha slot orcutoiit 5 and 6,respe,

. dating el tri wi e r; cohdiiptbrsfil Figure 1' is ei aaeii, part y fist showing the elevator lock in the closed posi F .2 a e ev te i th thelatter dise'ngagedlor the open positi n these casings may of similar,,al

position. ,l:he flange l ,o fit he loclrnieiiibr A. is provided ,withapassage for V which .may be assumed as coming from .7 suitable source.of; electric an as they depot differ frofri other eleetrie cur rents,need notbe particularly described.

Mounted within the casingA and his of the flange 1, are clips losuitably apart and adapted to carry a block 11, which may be formed ofinsulatgm eriak 1,... 1;

i onsidering the block 11 a s formedofin-f sulating" material ,;it,hasi-made fast tel it a through pin12 held to the block by nutsgls, soasto' firmly'clamp thebloolr and posltion. i 5

The nuts 13 are designed to secure at minal 1 1 to a pin 12 and thisterminal in turn made fast tothe conductor 8, one terminates close tothe-slot or passage eo in a pair of fingers or flanges l5 carrying .be,1

tween them a corresponding insulatingblock 16 also carried by ,aclip 17so-that thedolock may be held firmly and yet removably --in the casingA. i i w ,1

Traversing the block '16 is aconducting. pin 18 held to the block byclamp nuts;19 similar to the nuts 13. I c I ,v

The clampnuts 19 hold acontactterminal, 20 to they pin 18 and thiscontactterminal 2O,v is made fast to the electriqconductofl), both ofthe conductors 8 and" 9 reaching ,the ex terior of the casing throughthe passage 7 in h flange w M o.

Located in the lo'ckjcasing- A- is arockarm 2 Which fe t e ak o l g t sm ybe. made of vulcanized fiber or some other such R e n to h rawi a 7two lock casings A and respe ctively an member and so shaped as to beheavier at one end than at the other so as to overbalance about a pivotpin 28 with a catch 7 end or hook 29 normally extending through thepassage 6 and capable of being projected through the passage 5 of theeasin A.

WVhen the lock is mounted upon an elevator door, the operation thereofmay be described as follows.

When the elevator lock, constructed in accordance with the. invention,is installed on the elevator door and easing, the memher A constitutesthe stationary casing and is carried by the stationary member, while theelevator door, which is usually a sliding member is carried by theelevator cage.

The lock casing A carries the electric conductors 8 and 9 whichtherefore need no adjustment. The conductor 8 is electrically connectedto the insulated pin 1 L, while the electric conductor 9 is electricallyconnected to the insulated pin 18.

So long as the lock casings A and B are not in engagement, theoverbalanced contact arm 22 rocks on an arm 80, on which it issupported, and drops to a supporting pin 31 in the casing A thuscarrying the contact fingers 25 and 26 out of engagement with the pins14; and 18. This occurs when the catch 27 has moved from engagement witha keeper 82 within the casing A.

When the catch 29 is manipulated by the hand of the operator, it may belifted out of the path of the keeper and the elevator door may be pulledaway from the casing A thus releasing the arm 22 and permitting the arm27 to be Withdrawn from the keeper 32.

When the catch 29 has entered the casing A, its natural tendency is togravitate behind the catch 32 and the arm 22, being an overbalanced arm,will drop down upon the shorter arm of the arms 22 thus causing thelonger end of the arm to lift with the result that the fingers 25 and 26are moved into engagement with the projecting ends ofthe pins 14 and 18causing the fingers carried by the arm 22 to make contact with thesepins and thus establish the circuit controlled thereby. When the arm 22is rocked to an approximately horizontal position,

which it does when engaged by the catch 29 with the door of the elevatormoved from within the casing A, the circuit through the conductors 8 and9 is broken and the lock is no longer affected by the catch 29.

The catch 29 is only affected when the catch has entered the casing Aand depressed the shorter end of the arm 22, so as to bring the contacts25 and 26 into electric engagement with the conductors 8 and 9, in whichcondition they will remain so long as the catch is held in engagementwith the arm 22.

When the two members of the elevator lock are caused to approach so thatthe catch 29 will enter through the openings 5 and 6, the catch 29 beingin the meantime manually elevated or even caused to ride onto the top ofthe arm 22, the electric circuit is completed.

The elevator cannot be started when the door is not shut because thecontrolling circuit through the conductors 8 and 9 is open or broken andthe elevator cannot be again started until the circuit is closed.

*What is claimed is 1. An elevator door lock comprising two coactingcasings, with one casing on the door and the other casing carried by andmovable with the elevator, a pivoted, overbalanced catch carried by thefirst named casing and movable into the second named casing, and arockable contact arm carried by the second named casing and havingspaced contact terminals in the path of the opposite ends of therockable'contact arm, and bridged by said contact arm when rocked byengagement therewith of the overbalanced catch.

2. An elevator door lock comprising two coacting casings, with onecasing on the door and the other casing carried by and movable with theelevator, a pivoted, overbalanced catch carried by the first namedcasing and movable into the second named casing, and a rockable contactarm carried by the second named casing and having spaced contactterminals in the path of the opposite ends of the rockable contact arm,and bridged by said contact arm when rocked by engagement therewith ofthe overbalanced catch, each of the spaced contacts being fixedlymounted in the casing appertaining thereto and the rockable contact armhaving joined contact fingers at opposite ends movable into engagementwith the spaced contacts to bridge them.

3. An elevator door lock comprising two coacting casings, one on the cardoorand the other carried on and movable with the elevator, a pivotedoverbalanced catch carried by the first named casing and movable intothe second named casing, a rockable contact arm carried by the firstnamed casing, spaced contact terminals in the path of arm and bridged bysaid contact arm when rocked by engagement with the Overbalanced catch,contact fingers carried by the rockable arm and electrically connectedthrough said arm to serve as bridging means for an electric circuit whenbrought into contact with the first named contact, and

an external electric circuit for completion by the electric contactscarried by the rock- 10 v able arm.

' In testimony whereof, we-aflix our signatures hereto.

i CHARLES W. CARR.

ROBERT J. DIXON. PETER 'W. CONOVER.

